Reinforced molded rotary brush back



March 28, 1967 E. L. VERHAGEN REINFORCED MOLDED ROTARY BRUSH BACK Filed Nov. 1, 1966 lllllll HHHM Edward L. Ve ridyelz United States Patent M 3 310 827 REINFORCED MOLDED KOTARY BRUSH BACK Edward L. Verhagen, Rahway, N.J., assignor to The Regina Corporation, Rahway, N.J., a corporation of Delaware Filed Nov. 1, 1966, Ser. No. 591,154 1 Claim. (Cl. 15-180) This invention relates to a reinforced molded rotary brush back of the type used in floor care machines.

The object of this invention is to provide an improved wearing surface and reinforcement in the hub portion of a rotary brush where a drive shaft enters the brush back.

Another object is to make the addition of such a reinforcement in an economic manner and with positive locking to the brush back.

Other objects and advantages will appear from the description which follows.

This invention is illustrated in the accompanying drawings in which:

FIGURE 1 is a top view of a brush embodying this invention.

FIGURE 2 is a side elevational view of the brush of FIGURE 1.

FIGURE 3 is a side elevational cross sectional view taken on line 3-3 of FIGURE 1.

Referring to the drawings, the rotary brush shown consists essentially of tufts of bristles 11 secured in the under surface of suitably molded plastic brush back 10. This is a type of brush commonly used in floor polishers, scrubbers and the like and may be removably attached to the vertical driving shaft of the floor care machine.

Heretofore it has been customary to provide an all metal hub for such plastic brushes to prevent wear on the plastic surface of the brush. This invention uses only so much metal as is needed for transmitting the rotation of the brush driving shaft to the brush. Thus with this invention the hub may be molded as an integral part of the brush back and because of the reduced metal requirement and its application, economy is effected and assembly facilitated.

Integrally molded with brush back is hub 13 having locking arms 14 projecting into the centrally located recess 17 which is an enlargement of the top of bore 15 of brush back 10.

Metal bushing 12 is a flat disc which seats in recess 17 on peripheral ledge 18 at the bottom thereof. It has indents in its periphery shaped and sized to receive lock- 3,316,827 Patented Mar. 28, 1967 ing arms 14. When assembled bushing 12 is seated in close fit engagement within recess 17 of brush back 10 and secured in place by heat swaging or other means. Slots 16 in bushing 12 are provided to receive the driving pin of a motor driven shaft. 7

As is usual with brushes of this kind the brush is slipped onto the driving shaft of a floor care machine and held with well known means in detachable engagement on the shaft and its driving pin. Rotation to the brush is imparted by contact between the driving pin and the bushing and not the molded plastic hub thus relieving the plastic hub of strain, wear and shock. The arms 14 insure locking of the bushing to the hub and increase the surface contact between them, principally along radial lines to better transmit the application of the force of the shaft rotation to the brush back.

By furnishing a single illustration of this invention it is not intended thereby to limit the scope of the invention.

What I claim is:

1. In a rotary brush a rigid brush back comprising a unitary molded discoid back and hub with a vertical contral bore adapted to fit on a driving shaft,

a recess surrounding the central bore in the top surface of the back,

a peripheral ledge within the recess on the bottom surface thereof,

a plurality of arms projecting inward of the recess above the ledge,

a flat metal disc with a hole therethrough in registry with the central bore and shaped to fit within the recess on top of the ledge in locking engagement with the projecting arms, and

radial slots outward from the hole in the metal disc adapted to receive the driving pin of a driving shaft.

References Cited by the Examiner UNITED STATES PATENTS 1,838,416 12/1931 Lecker 15-179 2,517,915 8/1950 Okun 15-180 3,011,191 12/1961 Hulsh 15-49 CHARLES A. WILLMUTH, Primary Examiner.

P. FELDMAN, Assistant Examiner. 

